Unlike standard Japanese, Ryukyuan dialects have special focus particles. Focus particles with direct objects in Miyako dialect can mark two types of information structure: a narrow focus limited to the direct object itself or a broad focus including the whole predicative constituent. However, an overt marking of the direct object in focus is a rare pattern due to the principle of economy. On the other hand, if a direct object does NOT belong to the focus domain it is overtly marked by the particle ba:. Finally, there are also syntactic, semantic and pragmatic factors that can influence the usage of a focus particle besides the information structure of the sentence.